/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePartyInterface.h
Notification when a new reservation request is received
typedef TMulticastDelegate_ThreeParams< void, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) &, const [FOnlinePartyId](API\Plugins\OnlineSubsystem\FOnlinePartyId) &, const [IOnlinePartyPendingJoinRequestInfo](API\Plugins\OnlineSubsystem\Interfaces\IOnlinePartyPendingJoinRequestIn-_2) & > FOnPartyJoinRequestReceived